Since 85 to 95% of these crops are GMO, it is safe to assume – unless provided proper certification – that “normal” dairy products contain GMO ingredients in one form or another.
2015, Cheryl J. Baldwin, The 10 Principles of Food Industry Sustainability, →ISBN, page 27:
Contains at least 70% organic ingredients and the rest of the product cannot be GMO, irradiated, or grown with sewage sludge